No passengers were on the bus, and the injured were in two passenger vehicles, troopers said.

The bus went off the right side of the road, crossed the curb, hit three vehicles on the off-ramp and continued for a distance, troopers said.The other vehicles involved were a pickup truck, a van and a car. The car had significant damage.

No charges will be filed, troopers said. The bus driver told troopers he choked on a piece of candy and blacked our due to losing oxygen.

The bus belongs to First Student, a charter school bus company with an office in Greensboro.